Scott faulkes

Hi all I have a frontera sport s 1996 and I would love to know where the code reader port is. Can anyone help. Few problems really she keeps on cutting out every so often but will restart every time. The problem happens more frequently now than it used to anyone have any idea as to what the problem might be? I've replaced the crank sensor coil pack and a few other bits but still no joy!! Please help pulling my hair out lol